JSON Formatter

1. Paste your JSON into the box or drop in a .json file.
2. Choose Format to add indentation or Minify to compress it.
3. If there’s an error, the message shows the line and column where it occurred. Fix it and try again.

Common JSON errors

• Trailing commas after the last item: {"a": 1,} is invalid JSON (it works in JavaScript, but not in JSON).
• Single quotes: keys and strings must use double quotes — {'a': 1} is invalid.
• Unquoted keys: {a: 1} is a JavaScript object, not JSON.
• Comments (// or /* */) aren’t allowed in standard JSON.
• Numbers with leading zeros (012) and NaN/Infinity aren’t valid JSON values.

Format or minify?

Formatted JSON (with 2- or 4-space indentation) is easier to read, review, and version. Minified JSON removes spaces and line breaks to reduce file size for API responses and configuration files sent over a network—the content stays exactly the same.